package com.reggie.controller;

import com.reggie.common.R;
import com.reggie.exception.BusinessException;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        String originalFilename = file.getOriginalFilename();

        String suffix = originalFilename.substring(originalFilename.indexOf("."));

        String fileName = UUID.randomUUID().toString() + suffix;

        File dir = new File(basePath);
        if(!dir.exists())
        {
            dir.mkdirs();
        }

        try {
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            throw new BusinessException("上传失败");
        }

        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        FileInputStream fileInputStream = null;
        ServletOutputStream outputStream = null;
        response.setContentType("image/jpeg");
        try {
            fileInputStream = new FileInputStream(new File(basePath + name));
            outputStream = response.getOutputStream();

            int len = 0;
            byte[] bytes = new byte[1024];
            while((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }
//            IOUtils.copy(fileInputStream, outputStream);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }finally {
            try {
                outputStream.close();
                fileInputStream.close();
            } catch (IOException e) {
                throw new BusinessException("下载失败");
            }
        }
    }
}
